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11.03.2014
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The final height of 1,776 ft (541 m) is reached by a cable-supported antenna which rises from a circular support ring and recalls the torch held aloft by the Statue of Liberty.
The 408-foot tall decorative spire encases an antenna with a lighting system to make it into a beacon. For security reasons, the building is set back approximately 90 ft (27.4 m) from West Street. The tower's structure is organized around a strong, redundant steel moment frame which consists of columns and beams linked by a combination of bolting and welding and resists lateral loads through the bending of the frame's elements. Ground for actual construction (different from the cornerstone placing) was broken on April 27, 2006. The height of the observation decks match the heights of the original World Trade Center's Twin Towers.


A three-foot thick core houses One World Trade Center's life-safety systems (elevators, risers, communications, stairs and sprinklers), the advanced life safety systems exceed that required by the New York City Building Code.
The tower has extra strong fireproofing whilst the air supply system incorporates chemical and biological filters, emergency stairs are extra-wide and pressurized. Each floor has a refuge area whilst enhanced elevators are housed in a protected central building core which serves all of the tower's floors. In conjunction with a concrete-core shear wall, the moment frame endows great rigidity and redundancy to the tower's overall structure. Rising above the base are 69 office floors which reach a height of 1,120 ft (341.3 m), this is further surmounted by mechanical floors (two of which are occupied by the Metropolitan Television Alliance), restaurants and observation decks at 1,368 ft (417 m). An 80 ft (24.3 m) high public lobby topped by a succession of mechanical floors rises from the plaza, in conjunction, these constitute the building's blast-resistant base which is 200 ft (61 m) tall.
The cubic base gives way to an octagonal plan at center whilst the glass parapet is square in plan and rotated 45 degrees from the base.


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It stands 1,776 ft (541 m) and is a reference to the year when the United States Declaration of Independence was signed.
The mid section's octagonal plan is achieved by facade planes which are comprised of eight alternately inverted isosceles triangles with bevelled edges.



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